2-42 Services and Feature Description
6866588D21-D Chapter 2 - MTP850 Ex/MTP810 Ex Product Information Manual March 2009
Terminal’s own ID: 1234567
User Enters: 890
SSI sent will be: 1234890
The following call types will be capable of utilizing short SSI for identifying users:
• Full-duplex Private Call: called party and calling party identification
• Half-duplex Private Call: called party and calling party identification
• Group Call: calling party identification and talking party identification
• Mobile Status: called party and calling party identification
• Short Data Bearer Service: called party and calling party identification
• Text Message Service: called party and calling party identification
13.2 Direct TETRA ID Addressing
13.2.1 ISSI
IMPORTANT: This feature is available only for the full keypad terminal.
Regardless of the short addressing scheme used, if the user is provisioned with the capability of
entering a real TETRA ISSI, and the user enters an ID of 7 digits, the number will be interpreted as
a real TETRA ISSI.
14 PEI Characteristics
The terminal supports a four-wire serial RS232 interface via the optional data cable, and a pre-
defined set of the AT commands.
Note: The set of AT commands is not compliant with the TETRA PEI standard [Ref 4].
14.1 Physical Layer
The terminal PEI physical layer is the RS232 interface and supports the following circuits as
specified in [Ref 22]:
• Transmit Data (TD)
• Receive Data (RD)
• Request To Send (RTS)
• Clear To Send (CTS)
• DCE Ready (DSR)
• DTE Ready (DTR)
• Carrier Detect (CD) (Received Line Signal Detector)
• Ring Indicator (RI) (Never Asserted)
The connection with the data device and opening of the PEI port is done when the user turns the
external device option on from the menu.
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